Piatnitzkysauridae

Piatnitzkysauridae is an extinct family of megalosauroid or basal allosauroid dinosaurs. It only consists of three to four known dinosaur genera: Condorraptor, Marshosaurus, Piatnitzkysaurus and possibly Xuanhanosaurus. The most complete and well-known member of this family is Piatnitzkysaurus, which also gives the family its name.,

==Description== thumb|left|A skull of Marshosaurus showing the maxilla So far, all known piatnitzkysaurids have only been found in Jurassic deposits of the western hemisphere/New world (however, if Xuanhanosaurus is included, this may expand their range). Piatnitzkysaurus and Condorraptor hail from the Cañadón Asfalto Formation of Argentina, which has been dated from the Toarcian epoch of the Early Jurassic to the Bathonian epoch of the Middle Jurassic (approximately 179 to 168 million years ago). Marshosaurus was found in the Morrison Formation of the United States, which was dated to the Kimmeridgian epoch of the Late Jurassic.